On Mon, Nov 16, 2015 at 03:22:13PM -0500, Benjamin Romer wrote: > From: Tim Sell <Timothy.Sell@xxxxxxxxxx> > > Ensure we properly lock between visorinput_channel_interrupt() and > devdata_create(). We now guarantee that interrupts will be disabled and > we will be holding lock_visor_dev at the time input_register_device() is > called (from register_client_keyboard() or register_client_mouse()), after > which we may quickly find ourselves in visorinput_open(), where we enable > interrupts, and hence may call visorinput_channel_interrupt(). > > Signed-off-by: Tim Sell <Timothy.Sell@xxxxxxxxxx> > Signed-off-by: Benjamin Romer <benjamin.romer@xxxxxxxxxx> > > --- > v2: the patch was resubmitted. > --- > drivers/staging/unisys/visorinput/visorinput.c | 12 +++++++----- > 1 file changed, 7 insertions(+), 5 deletions(-) > > diff --git a/drivers/staging/unisys/visorinput/visorinput.c b/drivers/staging/unisys/visorinput/visorinput.c > index 4620a49..8c22e0f 100644 > --- a/drivers/staging/unisys/visorinput/visorinput.c > +++ b/drivers/staging/unisys/visorinput/visorinput.c > @@ -415,6 +415,8 @@ devdata_create(struct visor_device *dev, enum visorinput_device_type devtype) > if (!devdata) > return NULL; > devdata->dev = dev; > + init_rwsem(&devdata->lock_visor_dev); > + down_write(&devdata->lock_visor_dev); A rwsem that is only used in write mode? Not good, just make this a "normal" lock please, unless you can document that a rwsem is faster. And for something like an input driver, I _really_ doubt you are ever going to prove this, or even need such a thing, please fix. thanks, greg k-h _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
